27
Problem
Possible causes
Things to try
“Er” error
message
No floor sensor installed
Isolate power and check that a compatible
NTC10K sensor probe is connected to terminals
6 & 7.
If no sensor is installed you will need to have
one installed or run the system on air/ambient
temperature only*
Faulty floor sensor
If there is a sensor connected then it may be
faulty. Disconnect the sensor from the terminals
and test the resistance using a multimeter on the
20K
Ω
setting.
The sensor is rated at 10K
Ω
at 25C and fluctuates
with temperature differences.
Depending on the temperature the resistance
reading should be somewhere between 8 - 12K
Ω.
If the sensor is faulty it will need to be replaced
Flashing
back-light or
any fault with
the display
or button
functions
Bad connection between display
and power unit
Take the front plate off of the thermostat using a
flat screwdriver.
Unplug the white ribbon cable and check the
cable and pins for any signs of damage. If no
damage is found replace the cable, click the
display back into position and turn on.
**Electric floor heating systems should not be covered by insulating objects such as rugs, dog beds or furniture that prevents air flow over the floor.
Covering a floor heating system in this way can cause overheating issues which can damage floor coverings and cause heating cable failure.
Need a hand? Call us on 0800 019 5899
You should not attempt to troubleshoot the wiring of your thermostat unless you are confident with
electrics and have switched off the supply. Call an electrician if you are not confident in doing this yourself.
